Screen.



PATENTED DB0. I2, 1905.

W. H. FERN.

SCREEN.

APPLICATION FILED 13,130.5. 1904.

2 SHEETS-SHEET 1.

PATENTED DBO. l2, 1905.

W. H. FERN.

SCREEN.

APPLICATION FILED DBO. 5. 1904.

2 SHE BTS--SHBET 2.

MIE

@wurm/dol ggf/M I @Norway Y ,PATENT @FFI-CE.

WILLIAM H. FERN, or soRANToN, PENNsYLvANA.

SCREEN To all whom it may concern,.-

Be it known that I, WILLIAM H. FERN, a citizen of the United States ofAmerica, residing at Scranton, in the county of Lackawanna and State ofPennsylvania, have inventedA certain new and useful Improvements inScreens, of which the following is a specification.

This invention relates to sitters and screens, and relates moreparticularly to that class employed for separating the various grades ofcoal, it being understood that it may be employed for ore or any othermaterial or substance.

An object of this invention is to provide a device of this characterthat will oscillate or swing in place of the ordinary form or revolvingscreen, and at the same time it is an object of the invention to providemeans whereby the screen may be moved longitudinally.

It is also an object of the invention to provide a novel constructionwhereby the passage of the coal within the screen is obstructed, andthereby greatly facilitating the result.

Furthermore, an object of the invention is Vto provide means whereby thereturn motion of the longitudinal movement of the screen is quicker thanthe first motion.

The invention also has for an object the provision of means whereby thelongitudinal movement of the screen is prevented from in-g juring themechanism for causing such move-j ment.

A further object of the invention is to pro-l vide a screen in which ahollow shaft is ,mount-1 ed on a second shaft, the said hollow shaftbeing adapted to move longitudinally of the` second shaft, said hollowshaft being com posed of sections in order that any portion becomingworn in practice may be easily replaced without undue cost, labor, oramount of time.

Still further, it is an object of the invention to produce a device ofthis character that will be simple in construction, economical tomanufacture, and eiiicient in practice.

With the above and other objects in view the invention consists of thedetail of construction and in the arrangement and combination of partsto be hereinafter more fully described and claimed.

In describing the invention in detail reference will be had to theaccompanying drawings, forming part of the specication, wherein likecharacters of reference will denote corresponding parts in the severalviews, and in which Figure 1 is view in perspective of the in-Speccation of Letters Patent.

Application filed December 5, 1904. Serial No. 235,513.

Patented Dec. 12, 1905.

vention. Fig. 2 is a longitudinal section of the invention with a partshown in slightlymodified form. Fig. 3 isa view in `section taken on theline of Fig. 1. Fig. 4 is a sectional view of the hollow shaft, and Fig.5 is a sectional view of a slightly-modified form of hollow shaft.

In the drawings, 1 indicates suitable bearings or supports in which ismounted the solid shaft 2. The shaft is adapted to be rocked oroscillated by the oppositely-extending arms 3, which are suitablysecured or keyed thereto. The Vfree ends of the arms are attached to thepitmen or rods 4, which extend tosuitable machinery or motor for givingthe necessary movement thereto. Mounted on the solid shaft andindependently movable thereof is a hollow shaft 5. This shaft 5 iscomposed of a plurality of transverse sections 6, which have formed ontheir meeting ends flanges 7, through which bolts or the like8 areinserted for holding the sections in their assembled position. Each ofthese sections are formed of longitudinal sections, the two sections 9and 10, as in Fig. 4, or in four sections 11, 12, 18,

and 14, as in Fig. 5. Of course it is not desired to be limited to thenumber of sections, as such a number may be employed as will meetpurposes of practice.

Secured to the hollow shaft 5 are the spiders 15, which areapproximately semicircular in form, with the outer periphery thereofnotched preferably at a point on a plane with the ends of the arms 16 ofthe spiders, as at 17. To these spiders are secured the screensections18, which conform to the periphery of the spiders, and therefore throughthe medium of the notches 17 form in the completed screen thelongitudinal ribs 19. These screensections are secured to the spider inany preferred or ordinary way, but should be so attached as to be easilyremoved. The screensections placed between the various spiders are ofdifferent mesh, as in general practice, a fine mesh at one end andincreasing in size toward the opposite end. In order that the screen mayoscillate with the solid shaft, elongated slots 20 are formed in certainof the transverse sections 6, through which pass the lugs 21, formed onthe solid shaft. slots and lugs are each oppositely arranged.

Coal is thrown into the screen at the end with the line mesh, and thescreen is caused to swing or oscillate, which imparts activity to thecoal. This activity is further enlivened by the transverse ribs of thescreen, which IOO These IIO - permits the coal to be more positivelyseparated. The spider-rim being within the screen also benefits theoperation.

Formed on one end of the hollow shaft or secured thereto is abearing-surface or plate 22, which is adapted to be engaged by a cam 23,mounted on a shaft 24, arranged at `right angles to the shaft 2. Theshaft 24; is suitably mounted in the bearings 25, and has on one end apulley 26, over which a belt or the like is adapted to pass to rotatethe same. By this construction the hollow shaft is moved longitudinallyof the solid shaft 2 in one direction, the said movement of the hollowshaft 5 on the shaft 2 being permitted by the elongated slots 20. Toimpart motion to the hollow shaft 5 in the opposite direction or toreturn it to its normal position, which is in close approximation to thecam, a spiral spring 27 is interposed between the opposite end of theshaft 5 and one of the supports l, said spring embracing the solidshaft. This spring 27 is to be of great strength and is adapted toimpart a quick motion to the shaft 5, much quicker than'the movementgiven by the cam. Ordinarily the action of the shaft 6 on its returnwould affect the mechanism of the cam; but to prevent this a stop-collar28 is attached to the solid shaft in a position over a point just inadvance of the contacting edge of the cam, so that in its first movementthe cam does not contact with the plate 22.

The longitudinal movement of the shaft 5 is liable to create frictionbetween the walls of the slots 2O and the lugs 21. When a slot hasbecome too much worn for efficient practice, it is necessary but toremove one of the longitudinal sections of the transverse section inwhich the slot is located and replace the section by a new one. Thesections having the slots are preferably made much smaller than theremaining sections, thereby saving an expense in material and labor. v

In Fig. 2 the invention illustrated is the same as the preceding inevery particular, eX- cept in the arrangement and position of the spiralspring for causing the return of the hollow shaft. lIn this form thespring a is interposed between one of the end flanges of a pipe-sectionc and the lugs d of the solid shaft e, the lugs of course riding in theelongated slots f of the hollow shaft g.

In the illustrations the hubs 29VV of the spiders are shown asinterposed between the end flanges of the transverse sections of thehollow tube; but of course they could be mounted on the said shaft andfully answer all purpose of practice.

From the foregoing the operation and construction of the device arethought to be clearly apparent, it being noted that all changes may beresorted tothat fairly fall within the scope of the claims withoutdeparting from value thereof.

Having thus fully described the invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a device of the character described, a suitably-su pported shaft,a hollow shaft thereon, means for oscillating the first-named shaft,connections between the first-named shaft and hollow shaft whereby saidhollow shaft oscillates therewith, said connections being such as toallow a longitudinal movement of the hollow shaft on the first-namedshaft, and means for imparting longitudinal movement to the hollow shaftand ascreensupported by the hollow shaft.

2. In a device of-the character described, la suitably-supported shaft,a hollow shaft thereon, lugs on thefirst-,named shaft engaging thehollowshaft, means for oscillating the firstnamed shaft, and means forimparting longitudinal movementito the hollow shaft vand a screensupported by the hollow shaft.

` 3. In a device of the character described,a suitably-supported shaft,a hollow shaft thereon, means whereby the shafts yare oscillatedsimultaneously, means for .imparting a longitudinal movement of the`hollow shaft independent of the first-named shaft, and a screensupported by the hollow shaft.

4. In a device of the character described, a

suitably-supported shaft, a hollow shaft thereon having slots, lugs onthe first-named shaft passing through the slots of the hollow shaft andriding therein, means for oscillating'the first-named shaft and meansforfreciprocating the hollow shaft.

5. In a device of the character described, a suitably -supported shaft,a vhollow shaft mounted thereon, said hollow shaft being formed of aplurality of transversesections,-

spiders having their hubs interposed-between the opposing edges of thetransverse sections and secured thereto and screen-.sections secured tothe spiders.

6. In a device of thecharacter described,va suitably-supported shaft, ahollow shaft thereon, means for oscillating the first-named shaft,

TOO

IIO

a plate secured to an end of the hollow shaft,

connections between the first-named shaft and the hollow shaft, wherebysaid hollow shaft oscillates therewith, said connections being such asto allow a longitudinal movement of the hollow shaft on the .first-namedshaft, a suitably-driven cam engaging the plate of the hollow shaft formoving said shaft .in one direction and means for yimparting motion tothe hollow shaft in the opposite direction.

7. In a device of the character described, a suitably-supported shaft,ahollow shaft thereon, means for oscillating the first-named shaft, aplate secured to an end-of the hollow shaft, connections between'thefirst-named shaft and thev hollow shaft, whereby said vhollow shaftoscillates therewith, `said .connections being such as to allow alongitudinal movementof IIS the hollow 'shaft on the First-named shaft,a l In testimony whereof aiix my Signature, suitably-driven cam engagingthe plate of the in the presence of two witnesses, this 23d day IOhollow shaft for moving said shaft in one (lliof November, 1904.reetion, means for imparting motion to t e T 5 hollow shaft in theopposite direction, and a Vl ILLIAM H' FERN' collar on the first-namedshaft to limit the Witnesses: second movement of the hollow shaft, withR. W. MORGAN, relation to the cam. A. W. MUSGRAVE.

